commercial metal door with window,fire rated clean room emergecy door,36 inch commercial steel door

The difference between the fire resistance limit of the fire door: the fire door is divided into A, B, C, which is the fire resistance integrity of the fire door, that is, the fire resistance time, the current standard is the fire prevention time is not less than 1.5 hours, class B is not less than 1.0 hours, class C is not less than 0.6 hours.

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